condition	mean	min	max
4 h after light	20.907200000000003	19.7584	22.056
8 h after light	8.786539999999999	8.11737	9.45571
12 h after light	8.210825	7.70667	8.71498
4 h after dark	4.01595	3.63884	4.39306
8 h after dark	11.99385	11.8961	12.0916
12 h after dark	13.1955	12.1541	14.2369